Title of Invention

ROTOR POSITION SENSOR MOUNTING ASSEMBLY FOR A BURSHLESS DC MOTOR AND A METHOD OF MAKING THE SAME

Abstract

A rotor position sensor mounting assembly (15) for brushless DC motor (1A). It comprises a planar attachment (16) (for example E-shaped) of electrically insulating material comprising at least two spaced locator members (16e,16e)extending parallelly from one side thereof and adapted to be located in two adjacent stator slots(5). At least one of the locator members is provided with locking means (16f) to lock the sensor mounting assembly to the stator.The attachment further comprises electrical paths(17) and solder pads (18a,18b,18c and 18d) printed thereon and at least one hall effect sensor (19a,19b,19c) soldered on one of the solder pads (fig 8).

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) (As amended by the Patents (Amendment) Ordinance, 2004) & The Patents (Amendment) Rules, 2005 COMPLETE SPECIFICATION (See section 10 and rule 13) TITLE OF THE INVENTION Rotor position sensor mounting assembly for brushless DC motor INVENTOR Name : Alakkal Kizhakkethil Sivadas Nationality: Indian National Address : Crompton Greaves Ltd Corporate R&D and Quality Analytical Laboratory , Kanjur Marg(E), Mumbai - 400042, Maharashtra, India APPLICANTS Name : CROMPTON GREAVES LIMITED Nationality: Indian Company Address : CG House, Dr Annie Besant Road, Prabhadevi, Mumbai 400025, Maharashtra, India PREAMBLE TO THE DESCRIPTION The following specification particularly describes the nature of this invention and the manner in which it is to be performed : FIELD OF INVENTION This invention relates to a rotor position sensor mounting assembly for brushless DC motor. This invention also relates to a method of manufacturing the rotor position sensor mounting assembly and a brushless DC motor comprising the sensor mounting assembly. BACKGROUND OF INVENTION Operation of brushless DC (BLDC) motors is controlled by an electronic controller by sensing the rotor position of the motors. In order to ensure smooth rotation and functioning of the motors, it is necessary to accurately sense the rotor position thereof. Encoders and resolvers are known to be used for accurately detecting rotor positions of brushless DC motors. Encoders are very expensive precision built sensitive devices and are to be mechanically, electrically and optically matched and calibrated with the pole magnets of the rotor of the motors. Resolvers are also very expensive precision built sensitive devices and their use is typically limited to applications which do not require high quality motor control over a wide speed range. US Patent No 4847527 describes an apparatus for precisely positioning at least one hall effect sensor in electric motors in order to sense the polarity of the pole magnets of the rotor directly. The apparatus comprises a mounting fixture in the form of an enclosure in which 2 the sensor is installed in a pocket provided therein. The apparatus also comprises attachment means in the form of atleast one locator tang extending outwardly from the lower side of the enclosure and integrally formed with it. The enclosure is mounted to the stator by fitting the tang in a stator slot. The lead wires from the sensor are connected to a cable located in a channel at one side of the enclosure along a circuit board which helps to connect the lead wires to the sensor in a predetermined manner. The enclosure occupies large area correspondingly increasing the size and cost of the motor. The apparatus comprises a large number of component parts because of which it is expensive and its assembly is time consuming. The tang may loosen in the stator slot thereby causing misalignment between the hall effect sensor and pole magnets of the rotor resulting in degradation in the motor operation. Generally the tang located in the respective stator slot mouth (opening) extends into certain area in the stator slot adjoining the mouth thereof. In order to accommodate the tang, the winding size in the respective stator slot needs to be redesigned and limited. Therefore, winding size in the remaining stator slots is also to be correspondingly redesigned and limited. This results in underutilization of the stator slots. It may also require additional cost for making the stator slot mouth receiving the tang bigger so as to accommodate the tang. The conductors in the stator slots are insulated with insulating material located in the mouths thereof. US Patent No 6354162 relates to a rotor position sensor mounting assembly which facilitates to sense the polarity of the pole magnets of the rotor directly. It comprises a housing and a hall effect sensor located within the housing and attached to a printed circuit board. A plurality of lead wires 3 from the sensor are soldered to the printed circuit board and connected to a cable tie. The stator includes a stator cap and a plurality of stator laminations formed with gaps. The housing includes two pairs of guides and is located in a gap in the stator with the guides attached to the end cap and stator laminations. The stator end cap made by plastic moulding increases the material and production costs of the stator and also the production time of the stator. The sensor is encapsulated in the housing. The lead wires and electrical connections are also encapsulated and insulated. Due to the large number of component parts of the sensor mounting assembly and due to its complicated construction, it is expensive and its production is time consuming. The sensor assembly and stator cap occupy a large area correspondingly increasing the cost and size of the electric motor. US Patents Nos 6522130 and 6693422 relate to a method of controlling a brushless electric motor which includes a rotor and a sense element with a plurality of magnetic pole pairs and first and second hall effect sensors. Magnetic flux of the magnetic pole pairs is measured using the first and second sensors and a corresponding measurement signal for each of the first and second sensors is output. Rotational position of the rotor based on the measurement signals is determined and the motor is controlled based on the determined rotor position. It requires a sense element which is usually mounted on the rotor shaft and the sensors are mounted in the motor housing or end shield in the proximity of the sense element. The sense element needs to be exact replica of the rotor magnets in terms of poles and polarity. Besides, precise adjustment of the sensors with the sense element during assembly of the motors is time consuming and practically difficult 4 and adds to production cost. Improper placement of the sensors with the sense element results in degradation of motor operation. OBJECTS OF INVENTION An object of the invention is to provide a rotor position sensor mounting assembly for a brushless DC motor, which is compact and which locates and locks rotor position sensor(s) precisely in position on the stator and maintains the position thereof so as to facilitate direct sensing of the polarity of the rotor magnet accurately at all times thereby eliminating the sense element and also the need for precise physical adjustment of the sensor with the pole magnets of the rotor and ensuring continuous and uniform torque of the motor and smooth operation of the motor and improving reliability of the motor. Another object of the invention is to provide a rotor position sensor mounting assembly for a brushless DC motor, which integrates the electrical connections into the mounting assembly thereby reducing the number of separate component parts and simplifying the construction thereof. Another object of the invention is to provide a rotor position sensor mounting assembly for a brushless DC motor, which requires reduced quantity of material and is cost effective. 5 Another object of the invention is to provide a rotor position sensor mounting assembly for a brushless DC motor, which does not call for size increase of the stator slots and redesigning and limitation of winding size in the stator slots and which facilitates full utilization of the stator slots. Another object of the invention is to provide a compact rotor position sensor mounting assembly for a brushless DC motor, which correspondingly reduces the size of the motor so as to save cost. Another object of the invention is to provide a rotor position sensor mounting assembly for a brushless DC motor, which eliminates the stator end cap and material cost thereof and also production cost and production time thereof. Another object of the invention is to provide a rotor position sensor mounting assembly for a brushless DC motor, which eliminates encapsulation of the sensor and lead wires and reduces material cost and production cost and production time. Another object of the invention is to provide a method of making the rotor position sensor mounting assembly for a brushless DC motor which is simple to carry out and which reduces production time so as to increase production efficiency. Another object of the invention is to provide a brushless DC motor comprising the rotor position sensor mounting assembly. 6 DETAILED DESCRIPTION OF INVENTION According to the invention there is provided a rotor position sensor mounting assembly for brushless DC motor comprising a planar attachment of electrically insulating material comprising at least two spaced locator members extending parallelly from one side thereof and adapted to be located in two adjacent stator slots, at least one of the locator members being provided with locking means to lock the sensor mounting assembly to the stator, the attachment further comprising electrical paths and solder pads printed thereon and at least one hall effect sensor soldered on one of the solder pads. According to the invention there is also provided a method of making a rotor position sensor mounting assembly for a brushless DC motor comprising printing electrical paths and solder pads on the conducting material layer of a cladded sheet comprising an electrically insulating material sheet cladded with a conducting material layer, punching out from the cladded sheet a planar attachment comprising the electrical paths and solder pads and at least two spaced locator members extending parallelly from one side thereof and adapted to be located in two adjacent stator slots, atleast one of the locator members being provided with locking means to lock the sensor mounting assembly to the stator and soldering at least one hall effect sensor on one of the solder pads . According to the invention there is also provided a brushless DC motor comprising housing, a stator assembly and a rotor assembly, the motor 7 further comprising a rotor position sensor mounting assembly comprising a planar attachment of electrically insulating material comprising at least two spaced locator members extending parallelly from one side thereof and adapted to be located in two adjacent slots in the stator of the stator assembly, at least one of the locator members being provided with locking means to lock the sensor mounting assembly to the stator, the attachment further comprising electrical paths and solder pads printed thereon and at least one hall effect sensor soldered on one of the solder pads. The following is detailed description of the invention with reference to the accompanying drawings, in which : Fig 1 is a crosssectional view of a brushless DC motor (internal rotor type) comprising a rotor position sensor mounting assembly according to an embodiment of the invention; Fig 2 is crosssectional view of the motor of Fig 1 at A-A of Fig 1; Fig 3 is side elevation of the stator of the motor of Fig 1 with the rotor position sensor mounting assembly located in the stator slots thereof; Fig 4 is part crosssectional view at B-B in Fig 3; Fig 5 is crosssectional view of a brushless DC motor (external rotor type) comprising a rotor position sensor mounting assembly according to an embodiment of the invention; 8 Fig 6 is crosssectional view of the motor of Fig 5 at line C-C in Fig 5; Fig 7 is part crosssectional view of the stator of Fig 1 with the rotor position sensor mounting assembly located in the stator slots thereof; Fig 8 is side view of the rotor position sensor mounting assembly of the motor of Fig 1 or Fig 5; Fig 9 is side view of a rotor position sensor mounting assembly according to another embodiment of the invention; and Fig 10 is side view of a rotor position sensor mounting assembly according to another embodiment of the invention. The embodiment of the invention as illustrated in Figs 1, 2, 3, 4, and 8 of the accompanying drawings, comprises an internal rotor type brushless DC motor 1A which includes a stator assembly 2 located in the motor housing 3 and comprising a stator core 4 provided with twelve stator slots 5 and conductor windings 6 located in the stator slots (Fig l and 2). The motor also includes a rotor assembly 8 comprising eight pole magnets 7 provided on a rotor 9 which is mounted on a shaft 10. The shaft is rotatably mounted in the housing and end shield 11 of the motor using bearings 12a and 12b. 13 is a cover provided on the non-drive end of the motor. The electronic controller 14 of the motor is located within the cover against the end shield. The motor further includes a rotor position sensor mounting assembly 15 comprising a E-shaped planar attachment 16 (Fig 8). The three limbs of 9 the attachment are marked 16a, 16b and 16c. The middle limb 16b is longer than the end limbs 16a and 16c and is provided with a flared central slit 16d along the length thereof to form two prongs 16e and 16e and render it flexible by closing or collapsing against each other. The prongs each is provided with a tapered locking head 16f at the tip thereof. The attachment further comprises electrical paths (tracks) collectively marked 17 and solder pads 18a, 18b, 18c and 18d printed thereon. The attachment also comprises three hall effect sensors marked 19a, 19b and 19c soldered on solder pads 18a, 18b and 18c respectively. The hall sensors may be digital or analog type. The attachment integrally formed with the electrical paths and solder pads and with the hall effect sensors soldered in place thereon, is positioned and mounted on the stator by collapsing or closing the prongs of the middle limb against each other and pushing it in the mouth of one of the predetermined stator slots. The prongs of the middle limb with the tapered heads at the tip in the collapsed state thereof passes through the mouth of the stator slot. The tapered heads of the middle limb in the closed state thereof guides and facilitates movement of the middle limb through the mouth of the stator slot. The middle limb is longer to extend across the entire thickness of the stator and as soon as the tapered heads of the middle limb cross over the rear side of the stator, the prongs move away from each other to their original position and the tapered heads abut and clasp against the rear side of the stator and locks the attachment with the sensors to the stator. The end limbs of the attachment enter the mouths of the adjacent stator slots and balance and stably position the attachment with the sensors on the stator. Due to the positive locking provided by the tapered heads of the middle limb, the position of the sensors is accurately maintained at all times so as to facilitate sensing of polarity of the rotor 10 magnets accurately continuously. The attachment with the sensors may be removed from the stator by disengaging the tapered locking heads of the middle limb from the stator by collapsing or closing the locking heads against each other and pulling out the attachment with the sensors when the limbs move out and disengage from the mouths of the respective stator slots. The solder pad 18d is for soldering the male part of a power mate connector for connecting the hall effect sensors to a DC power supply (not shown) and also for connecting the hall effect sensor outputs to the electronic controller. The hall effect sensors are connected to the DC supply through the electrical paths. Electrical connection to the electronic controller is made by plugging in the female part of the power mate connector to the male part thereof soldered on solder pad 18d. The cable connecting the terminal pad 18d i.e. the connector to DC supply is not shown. The cable connecting the solder pad 18d to the electronic controller is marked 20. The hall sensors are powered by the DC supply. During operation of the electric motor, the hall effect sensors output signals in the form of voltage pulses depending upon the pole magnets of the rotor sensed by them. Based on the signals received from the hall sensors, the electronic controller determines the rotor position and controls the operation of the motor in known manner. The embodiment of the invention as illustrated in Figs 5, 6 and 7of the accompanying drawings comprises an external type brushless DC motor IB which includes a stator assembly 21 comprising a stator core 22 provided with twelve stator slots 23 and conductor windings 24 located in the stator slots. The stator is mounted on a shaft 25. The motor also includes a rotor assembly 26 comprising eight pole magnets provided on a 11 rotor 28 which is fixed to the top end shield 29 of the motor. 30 is the bottom end shield. The electronic controller 31 of the motor is disposed within the top and bottom end shields and mounted on the shaft.Top and bottom end shields are clamped together and are rotatably attached to the shaft using bearings 32a and 32b. The motor further includes the rotor position sensor mounting assembly 15 described above mounted on the stator as described earlier. The cable connecting the hall effect sensors to the electronic controller is marked 33. Based on the signals received from the hall effect sensors the electronic controller senses the rotor position and controls the operation of the motor as described earlier. The rotor position sensor mounting assembly as illustrated in Fig 9of the accompanying drawings comprises a C-shaped planar attachment 35 whose two end limbs are marked 35a and 35b. One of the end limbs 35a is provided with a flared central slit 35c along the length thereof to form two prongs 35d and 35d and render it flexible by closing or collapsing against each other. The prongs each is provided with a tapered locking head 35e at the tip thereof. The electrical paths printed on the attachment are collectively marked 36. The solder pads printed on the attachment are marked 37a, 37b and 37c. The attachment comprises two hall effect sensors 38a and 38b soldered on the solder pads 37a and 37b, respectively. Solder pad 37c is for soldering the male part of a power mate connector. The limb 35a is longer to extend across the entire thickness of the stator. The attachment with the sensors is positioned and mounted on the stator and locked to the stator with the limb 35a as described earlier. The limb 35b of the attachment enters the mouth of an adjacent stator slot and balances and stabilises the attachment on the stator. 12 The rotor position sensor mounting assembly as illustrated in Fig 10 of the accompanying drawings is similar to that illustrated in Fig 10 except that it comprises only one hall effect sensor 39 soldered on a solder pad 40a on the C-shaped planar attachment 41. 40b is a second solder pad for soldering the male part of a power male connector. The electrical paths on the attachment are collectively marked 42. The end limbs of the attachment are marked 41a and 41b. One of the end limbs 41a is longer and is provided with a flared central slit 41c along the length thereof to form two prongs 41d and 41d and render it flexible. The prongs each is provided with a tapered locking head 41e at the tip thereof. The attachment with the sensor soldered thereon is mounted and located on the stator with the limb 41a as described earlier. The method of making the rotor position sensor mounting assembly of the invention comprises printing electrical paths and solder pads on the conducting material layer of a cladded sheet comprising an electrically insulating material sheet such as glass epoxy or paper phenolic cladded with a conducting material layer such as copper or copper alloys. The cladded sheet is readily available. The printing of electrical paths and solder pads is carried out in known manner using known techniques such as chemical etching or laser cutting. A planar attachment comprising the electrical paths and solder pads and at least two spaced locator members extending parallely from one side thereof and adapted to be located in two adjacent stator slots, is punched out from the cladded sheet. One of the locator members is provided with locking means. At least one hall effect sensor is soldered on a solder pad. 13 According to an embodiment of the invention the method comprises punching out from the cladded sheet a planar attachment which is C-shaped whose two end limbs constitute the locator members, one of the limbs being longer to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head at the tip thereof adapted to clasp against the rear side of the stator. According to another embodiment of the invention, the method comprises punching out from the cladded sheet a planar attachment which is E-shaped whose three limbs constitute the locator members, the middle limb being longer than the end limbs to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head at the tip thereof adapted to clasp against the rear side of the stator. The planar attachment of the invention locates and locks the rotor position sensor(s) precisely in position on the stator and prevents loosening of the asttachment on the stator. The position of the sensor(s) is* thus maintained accurately at all times so as to facilitate direct sensing of the pole magnets of the rotor accurately. This ensures continuous and uniform torque and smooth operation of the motor and improves reliability of the motor. It eliminates the sense element and also the need for precise physical adjustment of the sensor with the pole magnets of the rotor. Due 14 to integration of electrical paths and solder pads into the attachment and due to its being planar, it is very compact. Compactness and reduced material requirement of the attachment makes it cost effective. Integration of the electrical connections into the attachment reduces the number of components parts of the mounting assembly and simplifies its construction. The limbs (locator members) of the attachment are very thin (of the order .4 mm thick) and easily fit into the mouths of the stator slots. Therefore, the attachment of the invention does not call for size increase of the stator slots and redesigning and limitation of winding size in the stator slots thereby facilitating full utilization of the stator slots. Due to the compactness of the mounting assembly, the size of the motor is reduced correspondingly thereby giving further cost benefit. The invention eliminates the stator cap and associated material cost and production time and cost. The invention also eliminates encapsulation of the sensor and leadwires and reduces resultant material cost and production cost and time. The method of the invention is simple to carry out and reduces production time so as to increase production efficiency. The planar attachment of the invention may be of other shapes besides being C-shaped or E-shaped and may comprise more than three limbs. More than one limb of the attachment may be provided with the locking means. The flexible limb and locking means may be of other constructions. There may be more than three hall effect sensors. Electric cconnection from the sensor assembly to the electronic controller may be made either by plugging in a power male connector or directly soldering wires on the solder pads. Such variations in the construction of the planar attachment are to be construed and understood to be within the scope of the invention. 15 We Claim: 1) A rotor position sensor mounting assembly for brushless DC motor comprising a planar attachment of electrically insulating material comprising at least two spaced locator members extending parallelly from one side thereof and adapted to be located in two adjacent stator slots, at least one of the locator members being provided with locking means to lock the sensor mounting assembly to the stator, the attachment further comprising electrical paths and solder pads printed thereon and at least one hall effect sensor soldered on one of the solder pads. 2) A sensor mounting assembly as claimed in claim 1, wherein the attachment is C-shaped whose two end limbs constitute the locator members, one of the end limbs being longer to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head provided at the tip thereof adapted to clasp against the rear side of the stator. 3) A sensor mounting assembly as claimed in claim 1, wherein the attachment is E-shaped whose three limbs constitute the locator members, the middle limb being longer than the end limbs to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head provided at the tip thereof adapted to clasp against the rear side of the stator. 16 4) A sensor mounting assembly as claimed in claim 1, which comprises one, two or three digital or analog hall effect sensors, each soldered on a solder pad. 5) A method of making a rotor position sensor mounting assembly for a brushless DC motor comprising printing electrical paths and solder pads on the conducting material layer of a cladded sheet comprising an electrically insulating material sheet cladded with a conducting material layer, punching out from the cladded sheet a planar attachment comprising the electrical paths and solder pads and at least two spaced locator members extending parallelly from one side thereof and adapted to be located in two adjacent stator slots, atleast one of the locator members being provided with locking means to lock the sensor mounting assembly to the stator and soldering at least one hall effect sensor on one of the solder pads. 6) A method as claimed in claim 5, which comprises punching out from the cladded sheet a planar attachment which is C-shaped whose two end limbs constitute the locator members, one of the limbs being longer to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head at the tip thereof adapted to clasp against the rear side of the stator. 17 7) A method as claimed in claim 5, which comprises punching out from the cladded sheet a planar attachment which is E-shaped whose three limbs constitute the locator members, the middle limb being longer than the end limbs to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head at the tip thereof adapted to clasp against the rear side of the stator. 8) A method as claimed in claim 5, wherein the electrical paths and solder pads are printed on the attachment by chemical etching or by laser cutting. 9) A method as claimed in claim 5, which comprises soldering one, two or three digital or analog hall effect sensors, each on a solder pad. 10) A brushless DC motor comprising housing, a stator assembly and a rotor assembly, the motor further comprising a rotor position sensor mounting assembly comprising a planar attachment of electrically insulating material comprising at least two spaced locator members extending parallelly from one side thereof and adapted to be located in two adjacent slots in the stator of the stator assembly, at least one of the locator members being provided with locking means to lock the sensor mounting assembly to the stator, the attachment further comprising electrical paths and solder pads printed thereon and at least one hall effect sensor soldered on one of the solder pads. 18 11) A brushless DC motor as claimed in claim 10, wherein the attachment is C-shaped whose two end limbs constitute the locator members, the middle limb being longer than the end limbs to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head provided at the tip thereof adapted to clasp against the rear side of the stator. 12) A brushless DC motor as claimed in claim 10, wherein the attachment is E-shaped whose three limbs constitute constitute the locator members, the middle limb being longer than the end limbs to extend across the entire thickness of the stator and provided with a flared central slit along the length thereof to form two prongs and render it flexible, the prongs each being provided with a tapered locking head provided at the tip thereof adapted to clasp against the rear side of the stator. 13) A brushless DC motor as claimed in claim 10, which comprises one, two or three digital or analog hall effect sensors, each soldered on a solder pad. Dated this 21st day of March 2005 19 Abstract A rotor position sensor mounting assembly (15) for brushless DC motor(lA). It comprises a planar attachment (16) (for example E-shaped) of electrically insulating material comprising at least two spaced locator members (16e, 16e) extending parallelly from one side thereof and adapted to be located in two adjacent stator slots(5). At least one of the locator members is provided with locking means(16f) to lock the sensor mounting assembly to the stator. The attachment further comprises electrical paths (17) and solder pads (18a, 18b, 18c and 18d) printed thereon and at least one hall effect sensor (19a, 19b or 19c) soldered on one of the solder pads (Fig 8).

Documents:

318-mum-2005-abstract(29-3-2011).pdf

318-mum-2005-abstract(granted)-(13-6-2011).pdf

318-mum-2005-abstract.doc

318-mum-2005-abstract.pdf

318-mum-2005-cancelled pages(29-3-2011).pdf

318-MUM-2005-CLAIMS(AMENDED)-(29-3-2011).pdf

318-mum-2005-claims(granted)-(13-6-2011).pdf

318-mum-2005-claims.doc

318-mum-2005-claims.pdf

318-MUM-2005-CORRESPONDENCE(18-12-2009).pdf

318-mum-2005-correspondence(23-4-2008).pdf

318-mum-2005-correspondence(29-3-2011).pdf

318-MUM-2005-CORRESPONDENCE(3-10-2008).pdf

318-MUM-2005-CORRESPONDENCE(6-5-2009).pdf

318-mum-2005-correspondence(ipo)-(13-6-2011).pdf

318-mum-2005-correspondence-received-260505.pdf

318-mum-2005-correspondence-received-ver-260305.pdf

318-mum-2005-description (complete).pdf

318-mum-2005-description(granted)-(13-6-2011).pdf

318-mum-2005-drawing(granted)-(13-6-2011).pdf

318-mum-2005-drawings.pdf

318-mum-2005-form 1(27-5-2005).pdf

318-MUM-2005-FORM 1(29-3-2011).pdf

318-mum-2005-form 13(29-3-2011).pdf

318-mum-2005-form 18(7-12-2007).pdf

318-mum-2005-form 2(granted)-(13-6-2011).pdf

318-mum-2005-form 2(title page)-(22-3-2005).pdf

318-MUM-2005-FORM 2(TITLE PAGE)-(29-3-2011).pdf

318-mum-2005-form 2(title page)-(granted)-(13-6-2011).pdf

318-MUM-2005-FORM 26(29-3-2011).pdf

318-mum-2005-form-1.pdf

318-mum-2005-form-2.doc

318-mum-2005-form-2.pdf

318-mum-2005-form-26.pdf

318-mum-2005-form-3.pdf

318-MUM-2005-MARKED COPY(29-3-2011).pdf

318-MUM-2005-PUBLICATION REPORT(3-10-2008).pdf

318-MUM-2005-REPLY TO EXAMINATION REPORT(29-3-2011).pdf

318-MUM-2005-SPECIFICATION(AMENDED)-(29-3-2011).pdf

318-MUM-2005-URDIP SEARCH REPORT(31-12-2010).pdf

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